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Btrfs: fix wrong generation check of super block on a seed device 

The super block generation of the seed devices is not the same as the
filesystem which sprouted from them because we don't update the super
block on the seed devices when we change that new filesystem. So we
should not use the generation of that new filesystem to check the super
block generation on the seed devices, Fix it.

Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Miao Xie 2014-07-24 11:37:09 +08:00 committed by Chris Mason
parent 17a9be2f28
commit 5f546063ce
1 changed files with 5 additions and 1 deletions
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6
fs/btrfs/scrub.c
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@ -2832,7 +2832,11 @@ static noinline_for_stack int scrub_supers(struct scrub_ctx *sctx,
if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state))
return -EIO;
gen = root->fs_info->last_trans_committed;
/* Seed devices of a new filesystem has their own generation. */
if (scrub_dev->fs_devices != root->fs_info->fs_devices)
gen = scrub_dev->generation;
else
gen = root->fs_info->last_trans_committed;
for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
bytenr = btrfs_sb_offset(i);